ive played my personal copy to death and know literally everything about New Vegas and its my expert opinion that you've commited a crime before you saved (or it auto-saved) or their not really your friends (i.e. Powder Gangers, Fiends, etc.) or friends of your enemies. did you commit a crime against that faction anywhere on the map before the save? even your best friends (Idolized) will attack for even the smallest crime or if you got caught stealing something and ran you'll be attacked. you really have to look back at your actions before your save to figure it out
if you would have explained more i probably could have helped you better
RPG_FPS_GOD
Level: Bronze